#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<stdbool.h>

int main()
{
    pid_t id = fork();
    if(id == 0)
    {
        //子进程
        while(true)
        {
            printf("我是子进程，pid = %d,ppid = %d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else if(id > 0)
    {
        //父进程
        while(true)
        {
            printf("我是父进程，pid = %d,ppid = %d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else
    {
        //error
    }
    //printf("before:only one line\n");
    //fork();
    //printf("after:only one line\n");
   // while(1)
   // {
   //     printf("Im a process,my pid = %d , parent pid = %d\n ",getpid(),getppid());
   //     sleep(1);
   // }
    return 0;
}
